part one of adding tests, updating core

tests/Install/DefaultInstallationCommandTest.php

@@ -0,0 +1,51 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Flarum\Tests\Install;
+
+use Flarum\Install\Console\InstallCommand;
+use Flarum\Install\InstallServiceProvider;
+use Flarum\Tests\Test\TestCase;
+use Flarum\User\User;
+use Symfony\Component\Console\Input\StringInput;
+use Symfony\Component\Console\Output\StreamOutput;
+
+class DefaultsInstallationCommandTest extends TestCase
+{
+    protected $isInstalled = false;
+
+    /**
+     * @test
+     */
+    public function allows_forum_installation()
+    {
+        if (file_exists($this->app->basePath().DIRECTORY_SEPARATOR.'config.php')) {
+            unlink($this->app->basePath().DIRECTORY_SEPARATOR.'config.php');
+        }
+
+        $this->app->register(InstallServiceProvider::class);
+        /** @var InstallCommand $command */
+        $command = $this->app->make(InstallCommand::class);
+        $command->setDataSource($this->configuration);
+
+        $body = fopen('php://temp', 'wb+');
+        $input = new StringInput('');
+        $output = new StreamOutput($body);
+
+        $command->run($input, $output);
+
+        $this->assertFileExists($this->app->basePath().DIRECTORY_SEPARATOR.'config.php');
+
+        $admin = $this->configuration->getAdminUser();
+
+        $this->assertEquals(User::find(1)->username, $admin['username']);
+    }
+}